What must be adjusted to correct out of round circles

[theRatchet]

For setting 1 tooth to the 12 o’clock position; I really liked the ideas in this thread.

1. Just drape the chain over the sprocket and line up 2 links the same distance from the sprocket
2. Drape the chain and put a line level between the chains on either side and level it. (Line levels can be bought at any hardware store for about a $1-3 normally in a 2 pack or on Amazon )

Sprocket Alignment Technique

I was kinda amused at the dot one degree increments on the sprocket alignment window, I mean how could you tell? But it got me thinking about how to vertically align the sprockets as during the calibration you need to do that step once for the right and twice for the left motor. I used the chain and a cotter pin to align the sprocket. I draped the chain with the half way link over the top tooth. Then I pinned the open ends with the cotter pin. Using the adjustments until both legs were even…

This does assume that your frame is level to the earth, but I think that is a best practice to begin with.